Here's the deal: it's absolutely pointless to argue with him.  I've yet to see one example of a case where arguing the facts with quickseller led to him backing down.  It's his personality, he doesn't back down.  Once you've openly crossed him in public you are not going to get any respect from him unless he sees you as more powerful than him.  Those are literally the only people he shows any kind of humanity or deference towards.  Anyone else is SOL.  This is going to continue until the people above him recognize that allowing this guy to take a scorched earth policy with people who disagree with him is problematic.  However, because QS remains deferent to those above him, they don't actually experience the bullying, quicktempered, impossibly-arrogant side of him that the rest of us have to deal with.  Look at my case, he went after me with two different accounts leaving three negative feedbacks and we've literally never even traded or interacted beyond the fact that I called him out for his hot temper and had the audacity to argue with him in public.  He didn't need any evidence to do this to me, why would he need evidence for anything else he does?  This will last until someone above him corrects the situation by removing him from their trust list(s).